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A spontaneous myoepithelial carcinoma in the mammary gland of an aged female ICR (CD-1) mouse

We report a female Crlj:CD1(ICR) mouse with a spontaneous mammary gland tumor composed of biphasic tumor cells, i.e., epithelioid and spindle-shaped myoepithelial cells. Macroscopically, a subcutaneous mass, approximately 3 cm in diameter was found in the lumbodorsal region. Histopathologically, the...

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Detalles Bibliográficos
Autores principales: Ito, Tsuyoshi, Yoshida, Toshinori, Soma, Katsumi, Katoh, Yoshitaka, Shimada, Yuko, Ohnuma-Koyama, Aya, Takahashi, Naofumi, Okazaki, Yoshimasa, Shiga, Atsushi, Kuwahara, Maki, Harada, Takanori
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Japanese Society of Toxicologic Pathology 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5545678/
https://www.ncbi.nlm.nih.gov/pubmed/28798533
http://dx.doi.org/10.1293/tox.2016-0080
Descripción
Sumario:We report a female Crlj:CD1(ICR) mouse with a spontaneous mammary gland tumor composed of biphasic tumor cells, i.e., epithelioid and spindle-shaped myoepithelial cells. Macroscopically, a subcutaneous mass, approximately 3 cm in diameter was found in the lumbodorsal region. Histopathologically, the epithelioid cells proliferated in an alveolar or nest-like growth pattern, occasionally forming glandular-like structures. On the other hand, the spindle-shaped cells proliferated in a sarcomatous pattern. Normal mammary gland was observed in the vicinity of the tumor. Both types of tumor cells showed immunoreactivity for cytokeratin (wide spectrum screening), vimentin, S100, and p63. In addition, the epithelioid cells and spindle-shaped cells were immunopositive for glial fibrillary acidic protein and smooth muscle actin, respectively. Moderate atypia, high proliferative activity, massive necrosis, and partial infiltration to the surrounding tissues were also observed. We made a diagnosis of myoepithelial carcinoma, which is extremely rare in ICR mice.